Brief on working of the said circuit towards force activation/de-activation of relay beyond upper/lower cutoff is also requested. there are two things which might be causing this problem: battery power not reaching the inverter, battery not charged or the relay changeovers are faulty and not transferring the relevant power lines across the output, Sir Iam B.V.R I have DC TO AC 200W pwr inverter(12V DC to 220V AC)(50HZ),I wanted to use this by solar pwr,So how much capacity of CCU and BAttery I can use in this circuit. Find here Inverter Card, Inverter PCB manufacturers, suppliers & exporters in India. There’s nothing more to replace on the mosfet power board because it composed of mosfet and capacitor. no charging sound is coming from UPS (earlier it was there, when main power goes and come the charging sound can hear clearly. The first one will work for 2hrs and after then it will start blinking all the led display light that it has and the output voltage will cease from supplying. I decided to change all 4 electrolytic capacitor connected to the H-bridge mosfet suspecting that the capacitor must have been slightly damaged causing the vibrating of transformer. My issue I with my stabiliser it’s showing delay and refusing to supply, could it be from the relay? Thank you very much for your reply. Please what do you think might be the issue? If yes then it could be due to this feature. Do you have any ideas? What could be the possibility? Bypass mode works well meaning transformer has no problem Now in the shop I replaced all the ten blown mosfets(five each side). If short circuit is across positive/negative, no parts of the circuit should have burned. My issue with a ready-made inverter is not considered here. Yes, it has no reversed polarity protection;I opened it and so far my ocular inspection shows NO sign of burnt out power devices, resistors, capacitors,etc. I searched electronic shops and I find 474k/630V, is it ok to use instead of 474/400V. if both these or one of these reading produces a zero result or lower than expected, in that case your charger circuit could be internally malfunctioning…. It could be due to insufficient initial current for the inverter to start the load…you can put a switch in series with the load, and initially keep it switched OFF….you can switch it ON once the inverter and the engine has gathered enough strength…..or alternatively you can upgrade the battery with a higher AH rated battery. Thanks. Isn't it too much for my appliances.. Also when I put tester in these switches the light glows in one of the hole.but when I turn switch on. Hi Daniel, MOSFETs are like switches, if replaced with an equivalent having identical specifications then it is absolutely safe and will make no difference in the performance. You can troubleshoot it by tracking and locating the "load" wires which may be terminating from the trafo output, and temporarily disconnect everything that might be associated with these wires….after doing this you could check whether the problems persists or not…if still it continues to behave in the same manner then the problem could be assumed to be on the primary side…. Also the 40v ac appears to be interfering (but I'm not certain) with various charging cycles from solar and wind controllers. If the whole thing is concealed and wired then it could be difficult to use external circuits with it, rather it would be better to get it completely examined and corrected by the repair personnel. Then I told him if he didn’t want to technically support me I would be pleased to talk to the manager and recommend he be transfered to sales! In the above explanation a couple of things become very critical for obtaining correct results from an inverter. Thanks for your assistance so far. Also make sure to connect a high watt DC bulb in series with the battery positive to ensure that the battery is not damaged in the process. Thanks in advance for your time. Then Fault code 7 upon day of removal from installation 3.It was blowing MOFETS one by one each time it was switched on in Inverter mode. Greetings Swagatam,My inverter has burned up a capacitor and the board specifies a different cap than the original, should I change the cap to the requirement printed on the board or just us the same original was 250V 470uf board has 450V 330 uf printed on it in this location. Hi Swagatam Congratulations for your excellent forum. When there is no fuse, it doesn't do that. • Post completion of 1-year standard warranty PCB will be repaired/replaced free of cost but the Consumer has to pay for the standard visit charges (as applicable at that time) and any other work being done during the visit. It still works to charge 2x 12volt batties but as soon as I remove the plug it goes into fault with no output. Thanks. As you can tell, I am an electronics moron.Do you think the servicemen from Exide will be able to get this together for me?Will this all cost more than a new Inverter?Are you saying that a new inverter will encounter the same problem? I have 2000watt inverter. Since from first damage and repeated Uptill now. The IC KA7500 was replaced for a new one. Hi Marthan, you said you removed the battery and replaced it directly with power source, I could not understand exactly what you did? Now I have placed a changed over switch to bypass inverter. For confirming whether it’s from the feedback transformer or not, temporarily remove the feedback link and check again with a meter. I have checked the fuse, it is OK.I have checked there is no loose connection also.Please help. The problem could be with your fan and or with your inverter, most probably it could be with your inverter….I think the output harmonic filter circuit might be malfunctioning, an involved capacitor might have gone short or faulty. Can you help? It cannot charge the battery while the transformer has provided the DC voltage through the help of the Big relay. (probably not enough voltage to light the neon bulb). Still have doubts...feel free to post your specific questions here. you’ll have to check with an ammeter as explained in the previous comment, Dear Sir, I have come to customer site for online UPS(GPW100KVA). Can you please guide from your experience what can the fhoblem be. my 3kva inverter showing input voltage and there is no input voltage, how do i sort? I think some internal circuit stage might be malfunctioning and shorting the output possibly through a relay, on detection of a load. Can you please help me to solve the problem? 3: Component layout for the PCB Download PCB and Component Layout PDFs: click here. I think the low voltage detector stage has gone faulty or the preset adjustment could have been affected or the preset itself has become faulty…you may check for one of these issues. But to me, I think this resistors are what prevent inverter to accept the battery, because they are working as a trigger. But still the same problem persists. It is around 6 years old. On reconnecting the power supply, the screen lights up, but a black warning triangle flashes and there is 0v output. Even after power failure if we flip the switch to off it goes off. Multi Air Conditioner. In this world it’s very difficult to find a person like you. 14081bg 1. You seem to be misjudging the fault…the fault could be due to some other reason not because of phase/neutral swapping….you will have to diagnose the fault by inspecting the various stages using a DMM. The working of the Dc-Ac converter circuit is very simple. You have to press and release the switch. 2) In case you find the oscillator stage working fine, go for the next stage i.e. I have no oscilloscope to verify the waveform or possible spikes, though I'll see if I can build a USB one. Here the basic circuit you will get. Hi Swagatam! Just to let it clear. Please advise. It would be impossible to judge without checking it practically…. the problem ie definitely with the inverter and the technician seems to be clueless regarding this simple issue. I have one doubt about inverter.im using 800va it is good condition but sometime come to ups mode when main supply on mode condition.suddenly interchange the main supply to ups mode but have EB supply is there. You’ll have open the inverer and add a ammeter in sires wit the battery positive, if it shows a sudden high current then something may be shorting somewhere, otherwise you may have to diagnose the load correction relay stage for a possible fault. Where could be the problem? Sorry, what I meant was that i mistakenly fed 220v into the output section of the inverter. endobj
Since the MOSFETs switch the primary of the transformer in a push-pull manner, this induces an alternating 220V or 120V AC across the secondary of the transformer. We can proceed accordingly once we know this. What is the most likely component in the inverter that could fail due to the inductive load which I subjected it to? If you miss the LED's (they will only light for a couple of seconds) the unit will try to start again 3 times with a 3 minute delay between each test. The power devices have nothing to do with the oscillator frequency. Hope you are doing fine. Please give advise. It blew the fuse of the voltage stabilizer( the inverter has a separate volt stabilizer connected to the transformer) I replaced the fuse,but connecting the inverter keeps sparking and burning off the negative battery wire with no output. and the negative connection is in the MOSFETs area. So, there's certainly some other serious issue with your inverter, not something which you can diagnose at home. So we hooked up the new battery!Where I live we have both 2 phase and 3 phase current going on at different times of the day, as this is village and small farm agri area also, so we have power cuts when the phasing goes on. This charger doesn't have any issue when plugged in at home, even though the mains is ungrounded. You may have to check whether or not the feedback is present or malfunctioning, or add a new feedback for the same. It is strange the fuse did not blow because of the short circuit. If the short is showing even after disconnecting the transformer then I think the problem could be somewhere in the mosfet stage….you could try removing the whole mosfet stage and check the situation again by switching ON power…. Disconnect the compressor from the inverter board, then check all 3 windings for continuity. But device switching from main PCB, check 500 watts high-frequency Dc-Ac circuit... 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